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<a class="jxr_linenumber" name="1" href="#1">1</a>   <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="2" href="#2">2</a>   <em class="jxr_comment"> *  Licensed to the Apache Software Foundation (ASF) under one</em>
<a class="jxr_linenumber" name="3" href="#3">3</a>   <em class="jxr_comment"> *  or more contributor license agreements.  See the NOTICE file</em>
<a class="jxr_linenumber" name="4" href="#4">4</a>   <em class="jxr_comment"> *  distributed with this work for additional information</em>
<a class="jxr_linenumber" name="5" href="#5">5</a>   <em class="jxr_comment"> *  regarding copyright ownership.  The ASF licenses this file</em>
<a class="jxr_linenumber" name="6" href="#6">6</a>   <em class="jxr_comment"> *  to you under the Apache License, Version 2.0 (the</em>
<a class="jxr_linenumber" name="7" href="#7">7</a>   <em class="jxr_comment"> *  "License"); you may not use this file except in compliance</em>
<a class="jxr_linenumber" name="8" href="#8">8</a>   <em class="jxr_comment"> *  with the License.  You may obtain a copy of the License at</em>
<a class="jxr_linenumber" name="9" href="#9">9</a>   <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="10" href="#10">10</a>  <em class="jxr_comment"> *    <a href="http://www.apache.org/licenses/LICENSE-2.0" target="alexandria_uri">http://www.apache.org/licenses/LICENSE-2.0</a></em>
<a class="jxr_linenumber" name="11" href="#11">11</a>  <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="12" href="#12">12</a>  <em class="jxr_comment"> *  Unless required by applicable law or agreed to in writing,</em>
<a class="jxr_linenumber" name="13" href="#13">13</a>  <em class="jxr_comment"> *  software distributed under the License is distributed on an</em>
<a class="jxr_linenumber" name="14" href="#14">14</a>  <em class="jxr_comment"> *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY</em>
<a class="jxr_linenumber" name="15" href="#15">15</a>  <em class="jxr_comment"> *  KIND, either express or implied.  See the License for the</em>
<a class="jxr_linenumber" name="16" href="#16">16</a>  <em class="jxr_comment"> *  specific language governing permissions and limitations</em>
<a class="jxr_linenumber" name="17" href="#17">17</a>  <em class="jxr_comment"> *  under the License.</em>
<a class="jxr_linenumber" name="18" href="#18">18</a>  <em class="jxr_comment"> *</em>
<a class="jxr_linenumber" name="19" href="#19">19</a>  <em class="jxr_comment"> */</em>
<a class="jxr_linenumber" name="20" href="#20">20</a>  <strong class="jxr_keyword">package</strong> org.apache.directory.mavibot.btree;
<a class="jxr_linenumber" name="21" href="#21">21</a>  
<a class="jxr_linenumber" name="22" href="#22">22</a>  
<a class="jxr_linenumber" name="23" href="#23">23</a>  <strong class="jxr_keyword">import</strong> <strong class="jxr_keyword">static</strong> org.junit.Assert.assertEquals;
<a class="jxr_linenumber" name="24" href="#24">24</a>  <strong class="jxr_keyword">import</strong> <strong class="jxr_keyword">static</strong> org.junit.Assert.fail;
<a class="jxr_linenumber" name="25" href="#25">25</a>  
<a class="jxr_linenumber" name="26" href="#26">26</a>  <strong class="jxr_keyword">import</strong> java.io.IOException;
<a class="jxr_linenumber" name="27" href="#27">27</a>  <strong class="jxr_keyword">import</strong> java.util.Random;
<a class="jxr_linenumber" name="28" href="#28">28</a>  <strong class="jxr_keyword">import</strong> java.util.concurrent.CountDownLatch;
<a class="jxr_linenumber" name="29" href="#29">29</a>  
<a class="jxr_linenumber" name="30" href="#30">30</a>  <strong class="jxr_keyword">import</strong> org.apache.directory.mavibot.btree.BTree;
<a class="jxr_linenumber" name="31" href="#31">31</a>  <strong class="jxr_keyword">import</strong> org.apache.directory.mavibot.btree.Tuple;
<a class="jxr_linenumber" name="32" href="#32">32</a>  <strong class="jxr_keyword">import</strong> org.apache.directory.mavibot.btree.TupleCursor;
<a class="jxr_linenumber" name="33" href="#33">33</a>  <strong class="jxr_keyword">import</strong> org.apache.directory.mavibot.btree.exception.KeyNotFoundException;
<a class="jxr_linenumber" name="34" href="#34">34</a>  <strong class="jxr_keyword">import</strong> org.apache.directory.mavibot.btree.serializer.LongSerializer;
<a class="jxr_linenumber" name="35" href="#35">35</a>  <strong class="jxr_keyword">import</strong> org.apache.directory.mavibot.btree.serializer.StringSerializer;
<a class="jxr_linenumber" name="36" href="#36">36</a>  <strong class="jxr_keyword">import</strong> org.junit.AfterClass;
<a class="jxr_linenumber" name="37" href="#37">37</a>  <strong class="jxr_keyword">import</strong> org.junit.BeforeClass;
<a class="jxr_linenumber" name="38" href="#38">38</a>  <strong class="jxr_keyword">import</strong> org.junit.Test;
<a class="jxr_linenumber" name="39" href="#39">39</a>  
<a class="jxr_linenumber" name="40" href="#40">40</a>  
<a class="jxr_linenumber" name="41" href="#41">41</a>  <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="42" href="#42">42</a>  <em class="jxr_javadoccomment"> * A class to test multi-threaded operations on the btree</em>
<a class="jxr_linenumber" name="43" href="#43">43</a>  <em class="jxr_javadoccomment"> *  </em>
<a class="jxr_linenumber" name="44" href="#44">44</a>  <em class="jxr_javadoccomment"> * @author &lt;a href="<a href="mailto:dev@directory.apache.org" target="alexandria_uri">mailto:dev@directory.apache.org</a>"&gt;Apache Directory Project&lt;/a&gt;</em>
<a class="jxr_linenumber" name="45" href="#45">45</a>  <em class="jxr_javadoccomment"> */</em>
<a class="jxr_linenumber" name="46" href="#46">46</a>  <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">class</strong> <a href="../../../../../org/apache/directory/mavibot/btree/MultiThreadedInMemoryBtreeTest.html">MultiThreadedInMemoryBtreeTest</a>
<a class="jxr_linenumber" name="47" href="#47">47</a>  {
<a class="jxr_linenumber" name="48" href="#48">48</a>      <em class="jxr_javadoccomment">/**</em><em class="jxr_javadoccomment"> The btree we use */</em>
<a class="jxr_linenumber" name="49" href="#49">49</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">static</strong> BTree&lt;Long, String&gt; btree;
<a class="jxr_linenumber" name="50" href="#50">50</a>  
<a class="jxr_linenumber" name="51" href="#51">51</a>  
<a class="jxr_linenumber" name="52" href="#52">52</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="53" href="#53">53</a>  <em class="jxr_javadoccomment">     * Create the btree once</em>
<a class="jxr_linenumber" name="54" href="#54">54</a>  <em class="jxr_javadoccomment">     * @throws IOException If the creation failed</em>
<a class="jxr_linenumber" name="55" href="#55">55</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="56" href="#56">56</a>      @BeforeClass
<a class="jxr_linenumber" name="57" href="#57">57</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> setup() <strong class="jxr_keyword">throws</strong> IOException
<a class="jxr_linenumber" name="58" href="#58">58</a>      {
<a class="jxr_linenumber" name="59" href="#59">59</a>          btree = BTreeFactory.createInMemoryBTree( <span class="jxr_string">"test"</span>, <strong class="jxr_keyword">new</strong> LongSerializer(), <strong class="jxr_keyword">new</strong> StringSerializer() );
<a class="jxr_linenumber" name="60" href="#60">60</a>      }
<a class="jxr_linenumber" name="61" href="#61">61</a>  
<a class="jxr_linenumber" name="62" href="#62">62</a>  
<a class="jxr_linenumber" name="63" href="#63">63</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="64" href="#64">64</a>  <em class="jxr_javadoccomment">     * Close the btree</em>
<a class="jxr_linenumber" name="65" href="#65">65</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="66" href="#66">66</a>      @AfterClass
<a class="jxr_linenumber" name="67" href="#67">67</a>      <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">static</strong> <strong class="jxr_keyword">void</strong> shutdown() <strong class="jxr_keyword">throws</strong> IOException
<a class="jxr_linenumber" name="68" href="#68">68</a>      {
<a class="jxr_linenumber" name="69" href="#69">69</a>          btree.close();
<a class="jxr_linenumber" name="70" href="#70">70</a>      }
<a class="jxr_linenumber" name="71" href="#71">71</a>  
<a class="jxr_linenumber" name="72" href="#72">72</a>  
<a class="jxr_linenumber" name="73" href="#73">73</a>      <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="74" href="#74">74</a>  <em class="jxr_javadoccomment">     * Create a btree with 50 000 elements in it</em>
<a class="jxr_linenumber" name="75" href="#75">75</a>  <em class="jxr_javadoccomment">     * @throws IOException If the creation failed</em>
<a class="jxr_linenumber" name="76" href="#76">76</a>  <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="77" href="#77">77</a>      <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">void</strong> create50KBTree() <strong class="jxr_keyword">throws</strong> IOException
<a class="jxr_linenumber" name="78" href="#78">78</a>      {
<a class="jxr_linenumber" name="79" href="#79">79</a>          Random random = <strong class="jxr_keyword">new</strong> Random( System.nanoTime() );
<a class="jxr_linenumber" name="80" href="#80">80</a>  
<a class="jxr_linenumber" name="81" href="#81">81</a>          <strong class="jxr_keyword">int</strong> nbElems = 50000;
<a class="jxr_linenumber" name="82" href="#82">82</a>  
<a class="jxr_linenumber" name="83" href="#83">83</a>          <em class="jxr_comment">// Create a BTree with 50 000 entries</em>
<a class="jxr_linenumber" name="84" href="#84">84</a>          btree.setPageSize( 32 );
<a class="jxr_linenumber" name="85" href="#85">85</a>  
<a class="jxr_linenumber" name="86" href="#86">86</a>          <strong class="jxr_keyword">for</strong> ( <strong class="jxr_keyword">int</strong> i = 0; i &lt; nbElems; i++ )
<a class="jxr_linenumber" name="87" href="#87">87</a>          {
<a class="jxr_linenumber" name="88" href="#88">88</a>              Long key = ( <strong class="jxr_keyword">long</strong> ) random.nextLong();
<a class="jxr_linenumber" name="89" href="#89">89</a>              String value = Long.toString( key );
<a class="jxr_linenumber" name="90" href="#90">90</a>  
<a class="jxr_linenumber" name="91" href="#91">91</a>              <strong class="jxr_keyword">try</strong>
<a class="jxr_linenumber" name="92" href="#92">92</a>              {
<a class="jxr_linenumber" name="93" href="#93">93</a>                  btree.insert( key, value );
<a class="jxr_linenumber" name="94" href="#94">94</a>  
<a class="jxr_linenumber" name="95" href="#95">95</a>                  <strong class="jxr_keyword">if</strong> ( i % 10000 == 0 )
<a class="jxr_linenumber" name="96" href="#96">96</a>                  {
<a class="jxr_linenumber" name="97" href="#97">97</a>                      System.out.println( <span class="jxr_string">"Written "</span> + i + <span class="jxr_string">" elements"</span> );
<a class="jxr_linenumber" name="98" href="#98">98</a>                  }
<a class="jxr_linenumber" name="99" href="#99">99</a>              }
<a class="jxr_linenumber" name="100" href="#100">100</a>             <strong class="jxr_keyword">catch</strong> ( Exception e )
<a class="jxr_linenumber" name="101" href="#101">101</a>             {
<a class="jxr_linenumber" name="102" href="#102">102</a>                 e.printStackTrace();
<a class="jxr_linenumber" name="103" href="#103">103</a>                 System.out.println( btree );
<a class="jxr_linenumber" name="104" href="#104">104</a>                 System.out.println( <span class="jxr_string">"Error while adding "</span> + value );
<a class="jxr_linenumber" name="105" href="#105">105</a>                 <strong class="jxr_keyword">return</strong>;
<a class="jxr_linenumber" name="106" href="#106">106</a>             }
<a class="jxr_linenumber" name="107" href="#107">107</a>         }
<a class="jxr_linenumber" name="108" href="#108">108</a>     }
<a class="jxr_linenumber" name="109" href="#109">109</a> 
<a class="jxr_linenumber" name="110" href="#110">110</a> 
<a class="jxr_linenumber" name="111" href="#111">111</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="112" href="#112">112</a> <em class="jxr_javadoccomment">     * Browse the btree in its current revision, reading all of its elements</em>
<a class="jxr_linenumber" name="113" href="#113">113</a> <em class="jxr_javadoccomment">     * @return The number of read elements </em>
<a class="jxr_linenumber" name="114" href="#114">114</a> <em class="jxr_javadoccomment">     * @throws IOException If the browse failed</em>
<a class="jxr_linenumber" name="115" href="#115">115</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="116" href="#116">116</a>     <strong class="jxr_keyword">private</strong> <strong class="jxr_keyword">int</strong> testBrowse() <strong class="jxr_keyword">throws</strong> IOException
<a class="jxr_linenumber" name="117" href="#117">117</a>     {
<a class="jxr_linenumber" name="118" href="#118">118</a>         TupleCursor&lt;Long, String&gt; cursor = btree.browse();
<a class="jxr_linenumber" name="119" href="#119">119</a> 
<a class="jxr_linenumber" name="120" href="#120">120</a>         <strong class="jxr_keyword">int</strong> nb = 0;
<a class="jxr_linenumber" name="121" href="#121">121</a>         <strong class="jxr_keyword">long</strong> elem = Long.MIN_VALUE;
<a class="jxr_linenumber" name="122" href="#122">122</a> 
<a class="jxr_linenumber" name="123" href="#123">123</a>         <strong class="jxr_keyword">while</strong> ( cursor.hasNext() )
<a class="jxr_linenumber" name="124" href="#124">124</a>         {
<a class="jxr_linenumber" name="125" href="#125">125</a>             Tuple&lt;Long, String&gt; res = cursor.next();
<a class="jxr_linenumber" name="126" href="#126">126</a> 
<a class="jxr_linenumber" name="127" href="#127">127</a>             <strong class="jxr_keyword">if</strong> ( res.getKey() &gt; elem )
<a class="jxr_linenumber" name="128" href="#128">128</a>             {
<a class="jxr_linenumber" name="129" href="#129">129</a>                 elem = res.getKey();
<a class="jxr_linenumber" name="130" href="#130">130</a>                 nb++;
<a class="jxr_linenumber" name="131" href="#131">131</a>             }
<a class="jxr_linenumber" name="132" href="#132">132</a>         }
<a class="jxr_linenumber" name="133" href="#133">133</a> 
<a class="jxr_linenumber" name="134" href="#134">134</a>         cursor.close();
<a class="jxr_linenumber" name="135" href="#135">135</a> 
<a class="jxr_linenumber" name="136" href="#136">136</a>         <strong class="jxr_keyword">return</strong> nb;
<a class="jxr_linenumber" name="137" href="#137">137</a>     }
<a class="jxr_linenumber" name="138" href="#138">138</a> 
<a class="jxr_linenumber" name="139" href="#139">139</a> 
<a class="jxr_linenumber" name="140" href="#140">140</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="141" href="#141">141</a> <em class="jxr_javadoccomment">     * Check that we can read the btree while it is being modified. We will start</em>
<a class="jxr_linenumber" name="142" href="#142">142</a> <em class="jxr_javadoccomment">     * 100 readers for one writer.</em>
<a class="jxr_linenumber" name="143" href="#143">143</a> <em class="jxr_javadoccomment">     * </em>
<a class="jxr_linenumber" name="144" href="#144">144</a> <em class="jxr_javadoccomment">     * @throws InterruptedException If the btree access failed.</em>
<a class="jxr_linenumber" name="145" href="#145">145</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="146" href="#146">146</a>     @Test
<a class="jxr_linenumber" name="147" href="#147">147</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testBrowseMultiThreads() <strong class="jxr_keyword">throws</strong> InterruptedException
<a class="jxr_linenumber" name="148" href="#148">148</a>     {
<a class="jxr_linenumber" name="149" href="#149">149</a>         <strong class="jxr_keyword">int</strong> nbThreads = 100;
<a class="jxr_linenumber" name="150" href="#150">150</a>         <strong class="jxr_keyword">final</strong> CountDownLatch latch = <strong class="jxr_keyword">new</strong> CountDownLatch( nbThreads );
<a class="jxr_linenumber" name="151" href="#151">151</a> 
<a class="jxr_linenumber" name="152" href="#152">152</a>         Thread writer = <strong class="jxr_keyword">new</strong> Thread()
<a class="jxr_linenumber" name="153" href="#153">153</a>         {
<a class="jxr_linenumber" name="154" href="#154">154</a>             <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run()
<a class="jxr_linenumber" name="155" href="#155">155</a>             {
<a class="jxr_linenumber" name="156" href="#156">156</a>                 <strong class="jxr_keyword">try</strong>
<a class="jxr_linenumber" name="157" href="#157">157</a>                 {
<a class="jxr_linenumber" name="158" href="#158">158</a>                     create50KBTree();
<a class="jxr_linenumber" name="159" href="#159">159</a>                 }
<a class="jxr_linenumber" name="160" href="#160">160</a>                 <strong class="jxr_keyword">catch</strong> ( Exception e )
<a class="jxr_linenumber" name="161" href="#161">161</a>                 {
<a class="jxr_linenumber" name="162" href="#162">162</a>                 }
<a class="jxr_linenumber" name="163" href="#163">163</a>             }
<a class="jxr_linenumber" name="164" href="#164">164</a>         };
<a class="jxr_linenumber" name="165" href="#165">165</a> 
<a class="jxr_linenumber" name="166" href="#166">166</a>         <strong class="jxr_keyword">long</strong> t0 = System.currentTimeMillis();
<a class="jxr_linenumber" name="167" href="#167">167</a> 
<a class="jxr_linenumber" name="168" href="#168">168</a>         <em class="jxr_comment">// Start the writer</em>
<a class="jxr_linenumber" name="169" href="#169">169</a>         writer.start();
<a class="jxr_linenumber" name="170" href="#170">170</a> 
<a class="jxr_linenumber" name="171" href="#171">171</a>         <strong class="jxr_keyword">for</strong> ( <strong class="jxr_keyword">int</strong> i = 0; i &lt; nbThreads; i++ )
<a class="jxr_linenumber" name="172" href="#172">172</a>         {
<a class="jxr_linenumber" name="173" href="#173">173</a>             Thread test = <strong class="jxr_keyword">new</strong> Thread()
<a class="jxr_linenumber" name="174" href="#174">174</a>             {
<a class="jxr_linenumber" name="175" href="#175">175</a>                 <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run()
<a class="jxr_linenumber" name="176" href="#176">176</a>                 {
<a class="jxr_linenumber" name="177" href="#177">177</a>                     <strong class="jxr_keyword">try</strong>
<a class="jxr_linenumber" name="178" href="#178">178</a>                     {
<a class="jxr_linenumber" name="179" href="#179">179</a>                         <strong class="jxr_keyword">int</strong> res = 0;
<a class="jxr_linenumber" name="180" href="#180">180</a>                         <strong class="jxr_keyword">int</strong> previous = -1;
<a class="jxr_linenumber" name="181" href="#181">181</a> 
<a class="jxr_linenumber" name="182" href="#182">182</a>                         <strong class="jxr_keyword">while</strong> ( previous &lt; res )
<a class="jxr_linenumber" name="183" href="#183">183</a>                         {
<a class="jxr_linenumber" name="184" href="#184">184</a>                             previous = res;
<a class="jxr_linenumber" name="185" href="#185">185</a>                             res = testBrowse();
<a class="jxr_linenumber" name="186" href="#186">186</a>                             Thread.sleep( 500 );
<a class="jxr_linenumber" name="187" href="#187">187</a>                         }
<a class="jxr_linenumber" name="188" href="#188">188</a> 
<a class="jxr_linenumber" name="189" href="#189">189</a>                         latch.countDown();
<a class="jxr_linenumber" name="190" href="#190">190</a>                     }
<a class="jxr_linenumber" name="191" href="#191">191</a>                     <strong class="jxr_keyword">catch</strong> ( Exception e )
<a class="jxr_linenumber" name="192" href="#192">192</a>                     {
<a class="jxr_linenumber" name="193" href="#193">193</a>                     }
<a class="jxr_linenumber" name="194" href="#194">194</a>                 }
<a class="jxr_linenumber" name="195" href="#195">195</a>             };
<a class="jxr_linenumber" name="196" href="#196">196</a> 
<a class="jxr_linenumber" name="197" href="#197">197</a>             <em class="jxr_comment">// Start each reader</em>
<a class="jxr_linenumber" name="198" href="#198">198</a>             test.start();
<a class="jxr_linenumber" name="199" href="#199">199</a>         }
<a class="jxr_linenumber" name="200" href="#200">200</a> 
<a class="jxr_linenumber" name="201" href="#201">201</a>         <em class="jxr_comment">// Wait for all the readers to be done</em>
<a class="jxr_linenumber" name="202" href="#202">202</a>         latch.await();
<a class="jxr_linenumber" name="203" href="#203">203</a> 
<a class="jxr_linenumber" name="204" href="#204">204</a>         <strong class="jxr_keyword">long</strong> t1 = System.currentTimeMillis();
<a class="jxr_linenumber" name="205" href="#205">205</a> 
<a class="jxr_linenumber" name="206" href="#206">206</a>         System.out.println( <span class="jxr_string">" Time to create 50K entries and to have "</span> + nbThreads + <span class="jxr_string">" threads reading them : "</span>
<a class="jxr_linenumber" name="207" href="#207">207</a>             + ( ( t1 - t0 ) / 1000 ) + <span class="jxr_string">" seconds"</span> );
<a class="jxr_linenumber" name="208" href="#208">208</a>     }
<a class="jxr_linenumber" name="209" href="#209">209</a> 
<a class="jxr_linenumber" name="210" href="#210">210</a> 
<a class="jxr_linenumber" name="211" href="#211">211</a>     <em class="jxr_javadoccomment">/**</em>
<a class="jxr_linenumber" name="212" href="#212">212</a> <em class="jxr_javadoccomment">     * Test that we can use many threads inserting data in a BTree</em>
<a class="jxr_linenumber" name="213" href="#213">213</a> <em class="jxr_javadoccomment">     * @throws InterruptedException</em>
<a class="jxr_linenumber" name="214" href="#214">214</a> <em class="jxr_javadoccomment">     */</em>
<a class="jxr_linenumber" name="215" href="#215">215</a>     @Test
<a class="jxr_linenumber" name="216" href="#216">216</a>     <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> testInsertMultiThreads() <strong class="jxr_keyword">throws</strong> InterruptedException, IOException
<a class="jxr_linenumber" name="217" href="#217">217</a>     {
<a class="jxr_linenumber" name="218" href="#218">218</a>         <strong class="jxr_keyword">int</strong> nbThreads = 100;
<a class="jxr_linenumber" name="219" href="#219">219</a>         <strong class="jxr_keyword">final</strong> CountDownLatch latch = <strong class="jxr_keyword">new</strong> CountDownLatch( nbThreads );
<a class="jxr_linenumber" name="220" href="#220">220</a> 
<a class="jxr_linenumber" name="221" href="#221">221</a>         <em class="jxr_comment">//Thread.sleep( 60000L );</em>
<a class="jxr_linenumber" name="222" href="#222">222</a> 
<a class="jxr_linenumber" name="223" href="#223">223</a>         <strong class="jxr_keyword">long</strong> t0 = System.currentTimeMillis();
<a class="jxr_linenumber" name="224" href="#224">224</a> 
<a class="jxr_linenumber" name="225" href="#225">225</a>         <strong class="jxr_keyword">for</strong> ( <strong class="jxr_keyword">int</strong> i = 0; i &lt; nbThreads; i++ )
<a class="jxr_linenumber" name="226" href="#226">226</a>         {
<a class="jxr_linenumber" name="227" href="#227">227</a>             <strong class="jxr_keyword">final</strong> <strong class="jxr_keyword">long</strong> prefix = i;
<a class="jxr_linenumber" name="228" href="#228">228</a>             Thread test = <strong class="jxr_keyword">new</strong> Thread()
<a class="jxr_linenumber" name="229" href="#229">229</a>             {
<a class="jxr_linenumber" name="230" href="#230">230</a>                 <strong class="jxr_keyword">public</strong> <strong class="jxr_keyword">void</strong> run()
<a class="jxr_linenumber" name="231" href="#231">231</a>                 {
<a class="jxr_linenumber" name="232" href="#232">232</a>                     <strong class="jxr_keyword">try</strong>
<a class="jxr_linenumber" name="233" href="#233">233</a>                     {
<a class="jxr_linenumber" name="234" href="#234">234</a>                         <em class="jxr_comment">// Inject 1000 elements</em>
<a class="jxr_linenumber" name="235" href="#235">235</a>                         <strong class="jxr_keyword">for</strong> ( <strong class="jxr_keyword">int</strong> j = 0; j &lt; 1000; j++ )
<a class="jxr_linenumber" name="236" href="#236">236</a>                         {
<a class="jxr_linenumber" name="237" href="#237">237</a>                             <strong class="jxr_keyword">long</strong> value = prefix * 1000 + j;
<a class="jxr_linenumber" name="238" href="#238">238</a>                             btree.insert( value, Long.toString( value ) );
<a class="jxr_linenumber" name="239" href="#239">239</a> 
<a class="jxr_linenumber" name="240" href="#240">240</a>                             <em class="jxr_comment">/*</em>
<a class="jxr_linenumber" name="241" href="#241">241</a> <em class="jxr_comment">                            if ( j % 10000 == 0 )</em>
<a class="jxr_linenumber" name="242" href="#242">242</a> <em class="jxr_comment">                            {</em>
<a class="jxr_linenumber" name="243" href="#243">243</a> <em class="jxr_comment">                                System.out.println( "Thread " + Thread.currentThread().getName() + " flushed " + j</em>
<a class="jxr_linenumber" name="244" href="#244">244</a> <em class="jxr_comment">                                    + " elements" );</em>
<a class="jxr_linenumber" name="245" href="#245">245</a> <em class="jxr_comment">                            }</em>
<a class="jxr_linenumber" name="246" href="#246">246</a> <em class="jxr_comment">                            */</em>
<a class="jxr_linenumber" name="247" href="#247">247</a>                         }
<a class="jxr_linenumber" name="248" href="#248">248</a> 
<a class="jxr_linenumber" name="249" href="#249">249</a>                         latch.countDown();
<a class="jxr_linenumber" name="250" href="#250">250</a>                     }
<a class="jxr_linenumber" name="251" href="#251">251</a>                     <strong class="jxr_keyword">catch</strong> ( Exception e )
<a class="jxr_linenumber" name="252" href="#252">252</a>                     {
<a class="jxr_linenumber" name="253" href="#253">253</a>                     }
<a class="jxr_linenumber" name="254" href="#254">254</a>                 }
<a class="jxr_linenumber" name="255" href="#255">255</a>             };
<a class="jxr_linenumber" name="256" href="#256">256</a> 
<a class="jxr_linenumber" name="257" href="#257">257</a>             <em class="jxr_comment">// Start each reader</em>
<a class="jxr_linenumber" name="258" href="#258">258</a>             test.start();
<a class="jxr_linenumber" name="259" href="#259">259</a>         }
<a class="jxr_linenumber" name="260" href="#260">260</a> 
<a class="jxr_linenumber" name="261" href="#261">261</a>         <em class="jxr_comment">// Wait for all the readers to be done</em>
<a class="jxr_linenumber" name="262" href="#262">262</a>         latch.await();
<a class="jxr_linenumber" name="263" href="#263">263</a> 
<a class="jxr_linenumber" name="264" href="#264">264</a>         <strong class="jxr_keyword">long</strong> t1 = System.currentTimeMillis();
<a class="jxr_linenumber" name="265" href="#265">265</a> 
<a class="jxr_linenumber" name="266" href="#266">266</a>         <em class="jxr_comment">// Check that the tree contains all the values</em>
<a class="jxr_linenumber" name="267" href="#267">267</a>         <strong class="jxr_keyword">try</strong>
<a class="jxr_linenumber" name="268" href="#268">268</a>         {
<a class="jxr_linenumber" name="269" href="#269">269</a>             <strong class="jxr_keyword">for</strong> ( <strong class="jxr_keyword">long</strong> i = 0L; i &lt; 10000L; i++ )
<a class="jxr_linenumber" name="270" href="#270">270</a>             {
<a class="jxr_linenumber" name="271" href="#271">271</a>                 assertEquals( Long.toString( i ), btree.get( i ) );
<a class="jxr_linenumber" name="272" href="#272">272</a>             }
<a class="jxr_linenumber" name="273" href="#273">273</a>         }
<a class="jxr_linenumber" name="274" href="#274">274</a>         <strong class="jxr_keyword">catch</strong> ( KeyNotFoundException knfe )
<a class="jxr_linenumber" name="275" href="#275">275</a>         {
<a class="jxr_linenumber" name="276" href="#276">276</a>             fail();
<a class="jxr_linenumber" name="277" href="#277">277</a>         }
<a class="jxr_linenumber" name="278" href="#278">278</a> 
<a class="jxr_linenumber" name="279" href="#279">279</a>         System.out.println( <span class="jxr_string">" Time to create 1M entries : "</span>
<a class="jxr_linenumber" name="280" href="#280">280</a>             + ( ( t1 - t0 ) / 1000 ) + <span class="jxr_string">" seconds"</span> );
<a class="jxr_linenumber" name="281" href="#281">281</a>     }
<a class="jxr_linenumber" name="282" href="#282">282</a> }
</pre>
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